172990818 has 96 divisors (see below), whose sum is σ = 503298432. Its totient is φ = 41472000.

The previous prime is 172990817. The next prime is 172990837. The reversal of 172990818 is 818099271.

It is a super-2 number, since 2×172990818² = 59851646224618248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172990817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13218 + ... + 22818.

It is an arithmetic number, because the mean of its divisors is an integer number (5242692).

Almost surely, 2^172990818 is an apocalyptic number.

172990818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172990818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251649216).

172990818 is an abundant number, since it is smaller than the sum of its proper divisors (330307614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172990818 is a wasteful number, since it uses less digits than its factorization.

172990818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9640 (or 9637 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 172990818 is about 13152.5973860679. The cubic root of 172990818 is about 557.1956074597.

The spelling of 172990818 in words is "one hundred seventy-two million, nine hundred ninety thousand, eight hundred eighteen".